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In character encoding conversion in PHP, we generally use iconv and mb_convert_encoding to operate, but the conversion performance of mb_convert_encoding is much worse than iconv.
string iconv ( string in_charset, string out_charset, string str )
Note: In addition to specifying the encoding to be converted to, the second parameter can also add two suffixes: //TRANSLIT and //IGNORE, where //TRANSLIT will automatically convert characters that cannot be directly converted into one or more Approximate characters, //IGNORE will ignore characters that cannot be converted, and the default effect is to truncate from the first illegal character.
Returns the converted string or FALSE on failure.
string mb_convert_encoding ( string str, string to_encoding [, mixed from_encoding] )
You need to enable the mbstring extension library first, and remove the ; in front of extension=php_mbstring.dll in php.ini
mb_convert_encoding can specify multiple input encodings. It will automatically identify based on the content, but the execution efficiency is much worse than iconv;
Use:
It was found that iconv would make an error when converting the character "-" to gb2312. Without the ignore parameter, all strings following this character cannot be saved. No matter what, this "—" cannot be converted successfully and cannot be output. In addition, mb_convert_encoding does not have this bug.
In general, use iconv. Only use the mb_convert_encoding function when you are unable to determine what the original encoding is, or when iconv cannot be displayed normally after conversion.
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* Automatically determine and convert gbk or gb2312 encoded strings to utf8 *Can automatically determine the encoding type of the input string. If it is UTF-8, there is no need to convert it. Otherwise, it will be converted to a UTF-8 string*Supported character encoding types are: utf-8, gbk, gb2312 *@$str:string string
function yang_gbk2utf8($str){ $charset = mb_detect_encoding()($str,array('UTF-8','GBK','GB2312'));$charset = strtolower($charset); If('cp936' == $charset){
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$str="Testing";<🎜> $cha=mb_detect_encoding($str);<🎜> echo $cha;<🎜> ?> |
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$str="Testing";<🎜> $cha=mb_detect_encoding($str);<🎜> $s = iconv($cha,"UTF-8",$str);<🎜> var_dump($s);<🎜> ?> |
Result returned:
string(0) “”
It's really strange why this happens.
Use
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代码如下 | 复制代码 |
$str="测试ing"; $cha=mb_detect_encoding($str); $s = iconv("GB2312","UTF-8",$str); var_dump($s); ?> |
$cha=mb_detect_encoding($str);
$s = iconv("GB2312","UTF-8",$str);
var_dump($s);
?>
代码如下 | 复制代码 |
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Function string mb_convert_encoding ( string $str , string $to_encoding [, mixed $from_encoding ] )
Can be converted to a string with a specified encoding, I wrote an example
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$str=chr(254)."Testing".chr(254);<🎜> $s = iconv("GB2312","UTF-8",$str);<🎜> var_dump($s);<🎜> ?> |
Return
string(0) “”
For the usage of mb_convert_encoding, please see the official website:
http://cn.php.net/manual/en/function.mb-convert-encoding.php
Another function iconv in PHP is also used to convert string encoding, and its function is similar to the function above.
There are some detailed examples below:
iconv — Convert string to requested character encoding
(PHP 4 >= 4.0.5, PHP 5)
mb_convert_encoding — Convert character encoding
(PHP 4 >= 4.0.6, PHP 5)
Usage:
string mb_convert_encoding ( string str, string to_encoding [, mixed from_encoding] )
You need to enable the mbstring extension library first, and remove the ; in front of extension=php_mbstring.dll in php.ini
mb_convert_encoding can specify multiple input encodings. It will automatically identify based on the content, but the execution efficiency is much worse than iconv;
string iconv (string in_charset, string out_charset, string str)
Note: In addition to specifying the encoding to be converted to, the second parameter can also add two suffixes: //TRANSLIT and //IGNORE, where //TRANSLIT will automatically convert characters that cannot be directly converted into one or more Approximate characters, //IGNORE will ignore characters that cannot be converted, and the default effect is to truncate from the first illegal character.
Returns the converted string or FALSE on failure.
Use:
It was found that iconv would make an error when converting the character "-" to gb2312. Without the ignore parameter, all strings following this character cannot be saved. No matter what, this "—" cannot be converted successfully and cannot be output. In addition, mb_convert_encoding does not have this bug.
Under normal circumstances, use iconv. Only use the mb_convert_encoding function when you cannot determine what the original encoding is, or when iconv cannot be displayed normally after conversion.
from_encoding is specified by character code name before conversion. it can be array or string – comma separated enumerated list. If it is not specified, the internal encoding will be used.
/* Auto detect encoding from JIS, eucjp-win, sjis-win, then convert str to UCS-2LE */
$str = mb_convert_encoding($str, “UCS-2LE”, “JIS, eucjp-win, sjis-win”);
/* “auto” is expanded to “ASCII,JIS,UTF-8,EUC-JP,SJIS” */
$str = mb_convert_encoding($str, “EUC-JP”, “auto”);
Example:
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$content = iconv("GBK", "UTF-8", $content);
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